Closes #27223
Merges: #27996, #26734, #27949 

Release Notes:

- AWS Bedrock: Added advanced authentication strategies with:
  - Short lived credentials with Session Tokens 
  - AWS Named Profile
  - EC2 Identity, Pod Identity, Web Identity
- AWS Bedrock: Added Claude 3.7 Thinking support.
- AWS Bedrock: Adding Cross Region Inference for all combinations of
regions and model availability.
- Agent Beta: Added support for AWS Bedrock.

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Co-authored-by: Marshall Bowers <git@maxdeviant.com>